Key Highlights

  • SK hynix, the South Korean memory maker, saw its US-traded line rise about 8% in pre-market trading on Wednesday, October 28, 2026, after the company's release of that day reported operating profit of KRW 83.3338 trillion, up 632%.
  • A Korean report of Monday, October 19, 2026 flagged a weaker won as a headwind, citing the annual report sensitivity that a 10% fall in the won would cost about 1.21 trillion won before tax.
  • The company reported an operating margin of 80% on revenue of KRW 104.6155 trillion, which leaves wide room to absorb currency effects, while cash of KRW 114.5 trillion exceeded borrowings of KRW 15.8 trillion.
  • The release does not state the quarterly exchange rate or the direction of the exposure, so the sensitivity cannot be converted into a precise margin effect, and the figures are preliminary and unaudited.

The Currency Question Behind the Rally

SK hynix, a South Korean maker of memory chips that reports in won, saw its US-traded line rise about 8% in pre-market trading on Wednesday, October 28, 2026, while Korean shares rose about 10%. The company's release of Wednesday, October 28, 2026 reported third quarter revenue of KRW 104.6155 trillion, up 328%, and operating profit of KRW 83.3338 trillion, up 632%. A Korean report of Monday, October 19, 2026 raised a weaker won as a headwind to the results. Exchange rate movements can affect translated profit and the value of foreign currency balances, although the release does not detail the mechanism behind the company sensitivity.

How the Reported Sensitivity Sizes the Exposure

The Korean report cited the company's annual report, which states that a 10% fall in the won would cause a pre-tax hit of about 1.21 trillion won. That figure is a sensitivity to a hypothetical move and not a forecast of a loss. Set against third quarter operating profit of KRW 83.3338 trillion, simple arithmetic puts the sensitivity near 1.5% of that profit figure. The calculation is an inference from two published numbers and assumes that a quarterly profit is a fair base for an annual sensitivity. The annual report mechanism is not detailed, and the exchange rate for the third quarter is not stated in the release.

Risks and What to Watch

The bull reading is that an operating margin of 80% leaves ample room to absorb a currency hit of this size, so the won is a second order issue next to memory prices. The bear reading is that the sensitivity is annual and applies to a hypothetical 10% fall, so a sharper move or a combination with falling memory prices would matter more. Three risks apply: the exposure direction and drivers are not described, the profit figures are preliminary and unaudited, and pre-market prices are thin. Investors should watch any currency commentary, the audited figures and the open at 9:30 a.m. ET on Wednesday, October 28, 2026.

Where Things Stand

The answer is that a weaker won appears to be a measurable but modest headwind against the scale of reported profit, since a 10% fall carries a pre-tax cost of about 1.21 trillion won according to the annual report. The key number is that sensitivity, which is near 1.5% of third quarter operating profit on simple arithmetic. The next catalysts are the 9:30 a.m. ET open on Wednesday, October 28, 2026, the decision of the Federal Reserve due later that day, and the audited results. Pre-market prices are snapshots and can change, and this is not investment advice.